Someobdy who doesn't smoke cigarettes. Straight-edge, health nut, or just regular people. Can be annoying for smokers as they hack and cough and complain when someone lights a cigarette within 100 feet.

As we all know, non-smokers are not cool, because they do not smoke. They say smoking causes wrinkles, well so does being a fucking nazi bitch!

The Urban Dictionary T-Shirt

Anyone who doesn't smoke. Usually very arrogent and ignorant in their opinion. Generally, they make it a hobby to be as ignorant as possible to smokers. Tend to believe they're superior and better than smokers. Also, a majority have never smoked therefore can not understand it from a smokers point of view, but their arrogence blinds them of this. Their arrogence also blinds of the fact that the air in any decent sized city isn't much cleaner.